This topic provides an example that shows the creation of a bitmap, the creation of an off-screen graphics device and graphics context for it, and the use of that graphics context to draw to the bitmap. Once a graphics context has been established for the bitmap, any of the GDI drawing functions can be used on the bitmap, as if it were the more common graphics context—the screen.
// Create a bitmap to be used off-screen. CFbsBitmap* offScreenBitmap = new (ELeave) CFbsBitmap(); CleanupStack::PushL(offScreenBitmap); User::LeaveIfError(offScreenBitmap->Create(TSize(100,100),EColor256)); // Create an off-screen device and context. CGraphicsContext* bitmapContext=NULL; CFbsBitmapDevice* bitmapDevice = CFbsBitmapDevice::NewL(offScreenBitmap); CleanupStack::PushL(bitmapDevice); User::LeaveIfError(bitmapDevice->CreateContext(bitmapContext)); CleanupStack::PushL(bitmapContext); // Draw something on the bitmap. TRect rect(0,0,100,100); bitmapContext->SetBrushColor(KRgbRed); bitmapContext->SetBrushStyle(CGraphicsContext::ESolidBrush); bitmapContext->DrawRect(rect); // a filled red rectangle // Now do what you want with it, such as blitting to the screen. gc.BitBlt(TPoint(20,20),offScreenBitmap); // Cleanup. CleanupStack::PopAndDestroy(3); ...
Copyright ©2010 Nokia Corporation and/or its subsidiary(-ies).
All rights reserved. Unless otherwise stated, these materials are provided under the terms of the Eclipse Public License v1.0.